DE1635289A1 - Device for uniform loading of material passing through a gap - Google Patents

Description

la-31 792

Description of the patent application

£. Du Pont de Nemours & Co. Ino, Wilmington, Delaware, TJ.SiA.

concerning

"Device for the even loading of * _{r material} passing through a gap"

The invention relates to a magnetically pre-stressed one Device for uniform loading of an "elongated"! Thread-like "or" _. 'Passing through a gap. Sledges "Good, like yarn, strands, webs, pollen, leaves, Tissue or the like and in particular a device with a pair of ferromagnetic devices that can move relative to one another for applying a load or a printer (printing devices), at least one of which is a roller rotatable about its longitudinal axis, wherein dad The pair forms a passage gap or the like, which can be changed on a magnetic V / ege, through which

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chen a running elongated good can pass through.

In many cases it is necessary that along the entire width of a device a uniform pressure for the treatment of a running elongated good on this is applied; to achieve this has so far been very difficult. With the calender roll sets as they are in-der Paper, textile and rubber industries are used for calendering, joining, coating, embossing and the like, warejs difficult to bring about an even pressure load over the entire length of the rollers, since the rollers even if it is only of moderate length, it bends in the middle opposite the rigidly held ends. In some cases it has use spherical rollers helped. Also by using back-up rollers to prevent undesirable Deflection, better results were obtained. Even so, the problem was not entirely satisfactory that way solved.

According to the invention is a magnetically prestressed device created for pressure loading of running elongated materials. This has a pair of ferromagnetic Pressure or loading devices, of which at least one is a roller rotatable about its horizontal axis, the pair forming a gap between them which receives the material and extends parallel to the longitudinal axis of the roller

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and wherein the pressure means are arranged to move freely against each other in such a direction in which the gap width is variable. Furthermore, at least one device is for generating a by the pressure devices in a longitudinal axis through the roll and the plane going through the gap with a magnetic plus (magnetic field) with a substantially more uniform Density provided by which the pressure devices are pressed against one another.

The following terms are used in the description and the Claims used according to the definitions given. "Magnetic pre-tensioning" is intended to be the pre-tensioning by means of permanent magnets, Include electromagnets and all combinations thereof. The term "roller" includes both cylindrical as well as conical rollers and the like. The arrangement of the printing devices, in which these "against each other are freely movable in such a direction in which the width of the gap defined by the pressure devices changes "should include all possible arrangements of the pressure devices through which the gap width can be changed, especially those in which only one printing direction of a pair of printing devices is opposite to the an_> which is movable, as well as constructions in which both pressure devices towards and from each other are movable away. Under "Deck equipment the equipment be understood with which a pressure or a load can be exerted on a material.

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The invention is explained in more detail using figures of several advantageous exemplary embodiments.

Show it:

FIG. 1 shows the side view of a first embodiment of the device according to the invention with a set of parallel rollers which can be electromagnetically prestressed against one another by a single symmetrically arranged electric coil }

FIG. 2 shows a plan view of a device according to FIG. 1; '

FIG. 3 shows a cross section along the line 3 - 3 in FIG. 1},

FIG. 3A shows a side view of a second embodiment of a device according to the invention similar to that in FIG Figures 1 to 3 shown, in which, however, a pair of electromagnetic tables Bias coils, one for each roller, are used;

Figure 3B is a cross-section along line 3B-3B in Figure 3B Fiber 3A;

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. 4 shows an end view within the right upright of a third embodiment of a device according to the invention with a parallel, electromagnetic with the help of a single symmetrically arranged electrical coil is biased, which a ferromagnetic yoke. for bundling which has magnetic field lines; da§ as a magnetic flux conductor serves, ■

! Pig. Figure 5 is an end view inside the right upright a fourth embodiment of a device according to the invention with a set of rollers consisting of three rollers, which is electromagnetically biased with a pair of electrical coils, one of which is the one on the straight machined good acting roller pretensioned and from * which the third roller part of the ferromagnetic yoke forms ».

Fig. Β is an end view inside the right stand a fifth embodiment of a device according to the invention with a roller set of four rollers, in which the magnetic bias can be generated by a pair of electrical ones, symmetrical to the rollers of the middle roller pair and the outer rollers serve as magnetic yokes;

Pig. 7 shows an end view inside the right upright of a sixth embodiment of a device according to the invention with a two-roller set, the electromagnetic

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is biased with a single spool, which is placed on one side of the rollers and with a single ferromagnetic yoke is equipped;

8 shows an end view within the right upright of a seventh embodiment of a device according to the invention / similar to that in Pig. 7 shown sixth device, but in which a pair of oppositely arranged Coils and magnet yokes are provided

fig. 9 is an end view inside the right upright an eighth embodiment of a device according to the invention with a two-roller set, which is electromagnetically operated by individual pairs of coils arranged opposite one another is biased, which are wound on a common ferromagnetic yoke forming cores; '

Pig. 10 shows a side section of the entire device according to Pig. 9 along line 10-10;

Pig. Figure 11 is a side view of a preferred embodiment of a two-roll device according to the invention;

Pig. 12 is an end view taken along line 12-12 in Pig. 11 |

Pig. Figure 13 is a cross section taken along line 13-13 in Pig. 11 y

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Pig. 14A and 14B corresponding longitudinal cross-sections of the left and the right side of the device according to FIG. 12 along lines 14-14j

■ Mg. 15 is a front view of a cooling line of the device 11 to 14 in the assembled state with the yokes assigned to them;

Figure 16 is an end view of the line in Figure 15J

17 shows a plan view of the line according to FIGS. 15 and 16;

Fig. 18 is a cross section taken along line 18-18 in Fig. 15;

19 shows a longitudinal cross-section with omitted Stand supports of a ninth embodiment of the device according to the invention with a two-roller Sats, be.i which the magnetic bias can be achieved by a permanent magnet;

19B shows an end view of the entire device according to FIG. 19A;

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Pig. 20 shows a longitudinal side section with the stand supports omitted a tenth embodiment of an according to the invention Device with a two-roller set and permanent magnets, and associated electrical coils for pressing the Y / cylinders against one another;

21 is a schematic representation of a circular electric coil?

FIG. 22 shows a cross section through the central axis of the coil from FIG. 21; FIG.

23 is a schematic representation of an elongated electrical coil;

FIG. 24 shows a cross section through the coil according to FIG. 23 along the line 24-24;

FIG. 25A is a schematic view omitting FIG Stand support of an eleventh embodiment of a device according to the invention, in which the short arcuate Coil-receiving yokes form the magnetic flux return between the two rollers of the printing device set;

25B is a schematic view of a modification the construction of Fig. 25A, in which ferromagnetic yokes of straight shape are used;

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Pig. 26 is a side view of the device according to Pig. 25B;

Pig. 27 A is a perspective view of a twelfth Embodiment of a device according to the invention with a single roller as part of the pair associated with one another. Printing means and with one reciprocating plate as the other;

Pig. 27B is a schematic side view of the device according to Pig. 27A;

Pig. 28A is a schematic side view under Y / E approval the stator support of a thirteenth embodiment of a device according to the invention with an angry one in succession Three-roller set, over which an endless belt is looped to support the material to be processed;

Pig. FIG. 28B is a schematic side view of a modification of the device according to FIG. 28A with magnet yokes wound around electric coils each of which is provided on opposite sides of the device;

Pig. 29A is a perspective view of a preferred embodiment of a device according to the invention having a single Y / alze as one of the pair of associated printing devices and a reciprocating one Plate than the other, and

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Pig. 29B is a schematic side view of the device according to Pig. 29A.

In Figures 1 to 3 is a first embodiment the device according to the invention shown. It has a pair of parallel-axis ferromagnetic (e.g. Soft iron manufactured) cylindrical rollers 1 and 3, which are arranged together in a vertical plane and form a gap between them to accommodate the material. In this example, the good is shown schematically at 20 ' a running web (or a fabric) is shown, which runs from the top right, see Figure 3, and to the left above after looping around the upper roller 1 by about 180 ° of the roller circumference of this runs.

In this example, the axes of these rollers lie in a vertical plane. The upper roller 1 is on its shaft 12 wedged or fastened in a similar manner. The shaft 12 is in plague camps on opposite sides 2 mounted on top of the stand 14. The roller 3 v / eist a concentric axis 13, the ends of which in the slots 15, preferably by means of slidably guided, not shown lagerblöoke are guided so that the roller in the vertical direction under the influence of the magnetic Bias, as will be described below, can move freely so that the rollers 1 and 3 are pressed against each other be and near the upper limit of the

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Slots 15 can come into tangential contact with one another. In doing so, they push it through the nip passing good together.

. In this first embodiment, the magnetic bias voltage is generated by an electrical coil 6, which is mounted symmetrically on two stands 19 that closely enclose the device along its entire circumference, the longitudinal center line of the coil coinciding with the horizontal plane through the gap . The coil is connected by lines 17 and 18 to a suitable direct current source. When the current is switched on, a magnetic field surrounding the coils is generated, the magnetic flux of which is closed by the ferromagnetic rollers 1 and 3, as a result of which they are firmly pressed against one another or pulled towards one another Same polarities over the entire length of the roller. The polarities or polarities that occur in each case depend on the type of coil winding and the direction of the electrical current through the coils Coil thickness is reached, have been placed one on top of the other, then the production of the elongated coil shape 6 with the two center lines 43 and 44, see FIG. 23, can be achieved in that the coil end sections are formed circularly around the imaginary center lines

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The axes 43 lie in the construction detailed in more detail and 44, however, in a plane parallel to the plane passing through the axes of rolls 1 and 3 and the nip perpendicular to these axes. It can be seen in particular from FIG. 2 that the straight sections of the coil 6 extend along the whole of the rollers 1 and 3. This training of the construction is important insofar as it causes an even magnetic load along the entire length of the roller.

A normal front drive is used to drive the rollers: can be used, e.g. by means of Hocke's or Cardon's couplings with a central pin to compensate for the longitudinal play. Particularly with small devices, the web to be processed can

* ί

can also simply be pulled through the gap when these are out- ' is strong enough to the. to withstand applied tension, j

In any case, the web is expediently before

Applying the sliding voltage to the coil 6 through the roller J

ι gap introduced. Then the roller 3 is magnetized by the I see preload pulled up. The force of attraction changes inversely proportional to the gap width. In some Cases can be hydraulic devices or the like for lifting the roller ends 13 of the lower roller up to the magnetic forces of attraction acting on the mass of the Y / alze

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v / acting forces of attraction safely overcome, be advantageous. A number of tools will be available to those skilled in the art for this purpose. The selection is determined by the special requirements of the feed slot. With the device according to the invention, very uniform line pressures between the rollers can easily be achieved. With the device according to FIGS. 1 to 3, a line pressure of 0.9 l / cm can easily be generated with a roller spacing of 0.25 mm, the rollers of which have a diameter of 7> 5 cm and a length of 63 cm exhibit. For this purpose, the coil 6 has 125 turns made of 2.5 mm insulated copper wire. The electric current is 40A in each case. ' -

It is of course also possible to run the web straight in the plane 20, provided that the spool 6 is designed to be sufficiently inclined or beveled so that the web has a sufficient distance from the spool edges as it passes through the Y / roll gap. Experiments have shown that the coil can be pivoted about their longitudinal axis by an angle of up to about 20 ° with respect to the plane in which the roller shafts and the roller gap lie, without a disadvantageous change in the magnetic field strength occurring. Ee i is of course also a further rotation of 45 ° to zn possible, but the magnetic field strength increases progressively from then. It follows from all of the above that in a preferred embodiment

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to use a construction shown in FIGS. 3A and 3B to achieve a sufficient distance from plane 20 is.

The arrangement of the roller pair 1, 3 according to FIGS. 1 to 3 has been retained, but separate electrical coils 6a and 6b are provided, which are symmetrical to one another in a horizontal plane passing through the roller axes. The resulting, for example, in the illustrated embodiment magnetically _v tables poles marked in the usual way with IT, and S. Of course, in order to achieve a favorable magnetic field direction, the current directions and winding arrangements of the two coils must be selected so that the overall magnetic bias voltage is also sufficiently high. If the two coils of this embodiment are the same size as those of the first embodiment, ie if the number of turns is doubled, then this brings about a considerable increase in the magnetic attraction and prestress. In a test setup in which the rollers 1 and 3 x each 7 »5 cm in diameter and 63 cm in length, the coils 6a and 6b each had 125 turns made of 2.5 mm thick insulated copper wire, the result with coils connected in series and a current of 4-0 A line pressure of about 3.2 kp / cm with a distance between the rollers of 0.25 mm.

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A third embodiment of a device according to the invention is shown in Figure 4, in which the Roll construction, the stands and the like with those the embodiment according to Figures 1 to 3 and 3A * and 3 B match, so that the same reference numerals are used, but here another coil 60 is provided, which has the same shape in its plane of extension like the coils 42 in Figure 23 and 6 in Figure 2, but with 250 turns of flat copper tape (e.g. 0.125 mm thick and 50 mm wide), whereby the windings are made of thin (0.025 mm) Polyester film is electrically isolated from each other. Here, too, the coil 16 encloses the entire device, with the straight length of the coil is equal to the length of the roll, The coil is built into opposite channel-like yokes for the magnetic field of the same shape, which are made of ferromagnetic steel sheets are made. The middle piece 21 of the yokes has a thickness of 13 mm, a height of 87 mm and a length of 625 mm. The yoke extends in the same direction as the rollers 1 and 3, its Web 22 consist of 13 mm thick, 25 mm wide and 625 mm long sheets, the ends of which are symmetrical to each other opposite at the level of the horizontal diameter of the rollers 1 and 3 with 0.75 mm distance from them are arranged. Of the The advantage of the built-in magnetic yokes can be seen in the fact recognize that line pressures of about 24 kgf / cm at a

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Roller spacing of 0.25 mm and an electrical current of only 30 A were achievable. The reason for this is that the high permeability of the yoke material to the entire magnetic The resistance of the magnetic path is considerably reduced and thereby the magnetic field density at a given Coil size and ampere turns greatly increased and thus the attractive forces increased particularly strongly.

Since the side access to the roller set is completely blocked in the construction according to Figure 4, the running The web is fed in from above and the roller is looped around 180 ° to exit back upwards in the same way, as has already been described for the first embodiment according to FIGS.

The embodiment of FIG. 5 is designed so that the incoming web 20 'can just traverse. In addition to the electromagnetic, it instructs on a stand 14 ordered two-roller set 1 and 3 already described, a third ferromagnetic roller 23. Their axis 13 ' is within the slot 15 'for free displacement in the vertical plane in the same way as the roller 3 of the first embodiment according to FIGS. 1 to 3 stored. In the construction, however, is the arrangement of the magnet yokes changed so that the upper yoke 24 consists of a downwardly open ferromagnetic channel, which is just as long as

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as is the corresponding reels 1, 3 and 23. In a similar way. ^{In a} way, the lower yoke 26 is formed from two opposing rails with an I-shaped cross-section, which together with the roller 23 together form a magnetic yoke which is complementary to the magnetic yoke 24. Correspondingly, individual coils 16a and 16b are provided for the individual rollers 1 and 3. Like the coil 16 already described, they are designed in accordance with FIG. The upper coil 16a is a magnetic yoke 24 and the lower coil 16b is arranged in the split L-shaped rails of the magnetic yoke 26. The magnetic poles are shown in the familiar Y / eise.

For example, the dimensions of the rollers 1, 3 and 23 of the device described are 75 mm in diameter χ 625 mm length.

The coils 16a and lob ^ fiwi ^ ls 250 copper tape turns of 0.125 mm thick and 50 mm wide, which were insulated layer by layer by 0.025 mm thick polyester film.

The magnet yokes 24 are 25 mm thick, 100 mm high and 238 mm wide and 900 mm long. The specified length is not critical; however, it should correspond to the length of the roller. In the present case, this length is chosen for the sake of simplicity, so that the ends of the magnet yokes can be attached to the r.

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The distance H between the upper roller 1 and the inner surface of the magnetic yoke 24 was 3 mm

The magnet yoke 26 was also as a one-piece piece like the magnet yoke 24, but was then made in the longitudinal direction Sawn open so that there is a gap of 76.5 mm for the magnet yoke roller 23 with a distance between the Y / alze 23 and the opposite surfaces of the magnet yoke 26 of 0.75 mm each remained.

The distance between the mutually associated webs of the magnet yokes 24 and 26 was 6.3 mm.

In a test with 25 A through each coil 16a and 16b, there was a line pressure between the rollers 1 and 3 of about 28 kp / cm in the gap with a gap width of 0.25 mm.

In the embodiment according to Fig. 5 it is necessary that the distance H compared to the gap width T, i.e. the compressed thickness of web 20 ·) is great; it should preferably be at least 10 times thicker. The reason for that is that when the coil is energized, the magnetic force of attraction between the upper roller 1 and the horizontal one Cross yoke of the horizontal cross piece of the magnetic yoke 24 can be so large that an upward deflection of one of the rollers 1 and 3 or even both is caused. That's why

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it is practical and beneficial to use the horizontal crosspiece of the Magnet.joches 24 slightly bent away from the upper circumference of the roller 1 and thereby the effective Increase gap H. However, this causes the magnetic reluctance of the upper magnetic path to increase one should only apply this measure to a limited extent.

The problem of generating countermeasures against magnetic attraction and deflection is eliminated in the embodiment according to FIG. 6, in which completely symmetrical upper and lower yoke structures are provided by additionally installing a fourth roller 27. This fourth roller rests on the roller 1 in tangential contact and is arranged in the space between the upper magnetic yoke 24 'in the same way as the roller 23 in the space between the magnetic yoke 26. The roller 27 is together with its axis 13 ^fl in the slots 15 "in The stand, not shown, is inadvertently supported in the same way as has already been described for the roller 23. Possible polarities are entered in the latter for an operational version of the device according to FIG.

In Fig. 7 an embodiment is shown in which the access to the pair of rollers is blocked only on one side is. In this embodiment, the need for the coil to enclose the entire device is avoided. here A one-piece channel-like shape is used for the yoke 28, around which the magnetizing coil 29 is wound as a core.

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Both ends of the yoke are made into a curved profile, which corresponds to the circumference of the rollers 1 and 3, opposite which the yoke ends symmetrically to the corresponding Horizontal diameters are arranged. In such a device, for example, occurring polarities are shown. The web 20 'to be processed enters from the left at the top and leaves the rollers at the bottom left after it has wrapped around roller 1 by 180 °. This embodiment has the disadvantage that an unbalanced There is a force acting on the rollers which it tries to push to the right. However, if the Free access to the rollers is the top priority, this disadvantage can be accepted.

The embodiment of FIG. 8 overcomes the unbalanced forces of the embodiment of Pig. 7 on by identically shaped magnet yokes 28 and 28-i- on opposite sides Sides of the two rollers are provided symmetrically to these. Both yokes each form one Core for the magnetizing coils 29 and 29 '. At a Embodiment of the device according to Pig. 8 as well as an experimental device according to Pig. 9 and 10, were similar hollow rollers with a diameter of 200 mm and a length of 300 mm and a thickness of 37 mm are used, while the magnetic yokes a height of 250 mm, a length of 300, a thickness of 50 mm and a width that is the length of the rollers directed ridges, of 218 mm. The coils 29 and 29 '

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had 800 V / indings made of insulated liupfer wire, 2.5 mm, while the gap between the pole and the roller was 8.4 mm. With a constant current of 45 A through the coils the line pressure between the rollers became about 52 kgf / cm measured with a gap width of 0.25 mm. The feed of the web 20 * took place in this]? All from above.

9 and 10, a further embodiment of the invention is shown which eliminates the need for UmschlJä3ung the whole device by a coil avoids. This device is a two-roll construction in which each roller is assigned a pair of coils, which are symmetrical to the level of the horizontal V / roller diameter this arranged ferromagnetic magnetic yoke cores wound are, v / which serve as magnetic flux conductors.

The ferr © magnetic yokes 31 »32, 31 'and 32' have approximately T-shaped cross-section, each pair of webs on the aligned with them assigned rollers and a distance of about 16 mm to the roller 1 and 8 mm to the roller 3 provided that it should be necessary to be able to feed the web from above, although the web 20 is normally horizontal and can be guided straight through the roller gap ο

The magnetic yokes © ines exemplary embodiment were off 50 mm thick soft iron with low carbon content

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manufactured, the webs executed on the rollers 1 and 3 measuring 305 mm long and 165 mm from the cross leg of the ϊ-shaped yoke, which was 50 mm thick and 550 mm long, so that the T-shaped yoke beams about 125 mm above the roller ends stood away. The straight pieces of the coils 33, 34, 35 and 36 extended about 38 mm beyond the roller ends, see FIG. 10. The yokes were independent of one another by means of screws 39 on non-ferromagnetic stirrups; slats 40 and 41 attached and each left a 6 mm Wt. " ^h en gap 37 and 38 at the same horizontal height as the Ίΐ- Lzenspitz so that a path can freely pass through the device. The end plates 40 and 41 can easily The stator 14 of the aforementioned embodiments is the replacement.Si® 'therefore have fixed bearings 2 for the upper roller and further seat braids 13 for the lower roller, see FIG. 10.

In the embodiment described, the coils 331, 34, 35 and 36 were connected in series. Each coil had 400 turns of insulated 2.5 mm copper wire, which were wound in such a way that the generated magnetism was added, as can be seen from the polarities shown in FIG. With a current of 30 A, 2ioh resulted in a line pressure of 81 kp / cm gap length with a gap width of 1.05 mm.

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A further preferred embodiment of a device according to the invention is shown in more detail in FIGS. 11 to 18 explained, while at the same time discussing a number of other auxiliary features that facilitate operation. These include an adjustable gap pressure, easy insertion of the web and dismantling for repair as well as a optional heating or cooling of the rollers.

The base frame of the apparatus, suitably "■ j-no *" - I ₁ ^ ~ rJjKintal uf_jl9n bottom prepared or anchored in it channel 61 which is designed as a welded construction of ferromagnetxschen plates. Stands 62 and 63, which are stiffened by transverse plates 64- are screwed to the channel 61 at opposite ends. The uprights accommodate a pair of ferromagnetic pressure devices in the form of rollers 1 and 3, which are mounted in corresponding bearing blocks 79 and 80. In the upright vertical slots 65 which are open at the top are incorporated in the longitudinal direction from above to almost downwards. They are finely machined on their inner edges 66 and 67, as well as on the outer surfaces 68. This creates flat guide paths for receiving the upper and lower pairs of bearing blocks 79 and 80, which have longitudinal slots that fit well over the stand guides in their vertical end faces. The lower bearing blocks

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also have grooves on their undersides and fit just over the tongues 62 'and 63' which define the lower boundaries of slots 65 in uprights 62 and 63. The tongues 62 'and 63' are with removable pins 69 on the Stands attached. Each of the two upper bearing blocks is at the top with the lower end of a piston rod 70 vertically arranged hydraulic lifting cylinder 71 is connected by means of a removable pin 73. The cylinders 71 are held by brackets 72 which span the upper end of the slot 65 and with the upper end of the stand 62 and 63 are screwed.

From the Pig. 12 and 13 it can be seen that the device is equipped with two thinner guides swal ζ s 74 and 75 made of non-ferro magnetic material. The guide rollers are mounted in stationary bearings 76 on the inside of the uprights 62 and 63 somewhat below the upper ends of the slots 65 at approximately the same horizontal height. From Figure 11 it can be seen that the right shaft ends of the guide rollers 74 and 75 extend beyond the stand 63; they are connected to a drive, not shown. During normal operation the rollers 74 and 75 lie on either side of the upper roller 1, the upper circumference being limited; lies somewhat above the circumference of the roller 1, as can be seen from FIG. When the two hydraulic jacks 71 are actuated at the same time, the is off

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the bearing blocks 79 and the existing roller unit mounted therein are raised to the upper end of the slots 65, whereby an unobstructed passage under the roller 1 and above the Y / alzen 75 and 74 for easy Insertion of the path to be processed is available.

Details of the construction of the rollers 1 and 3 can be seen in particular from FIGS. 14A and 14B. the Rollers consist of thick-walled tubes, which are closed at the right end by welded covers on which protruding stub shafts la and 3a fastened si..d, which are held in normal, in the right bearing blocks 79 and 80 Roller bearings 79a and 80a are performed. These stub shafts reach through the bearings and wear their ends couplings la 'and 3a', on which the drive of the shafts, not shown, engages. On the left sides the Y / alzen are also closed by means of welded covers, on which protruding shafts Ib and 3b on the outside

which are supported in roller bearings 79b and HOb received by the left bearing blocks 79 and 80. Both the lids and the shafts are at Ib 'and 3b 'axially pierced.

The rollers 1 and 3 are constructed so that condensate from them in a known manner, which is due to the centrifugal force is collected on the inside of the roller circumference,

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can be withdrawn via scoop-extraction nozzles 85a. the Scoop nozzles 85a are connected at their upper ends via swivel joints to a stationary horizontal drill 85, ■ which within a larger Eohrabschnitts 81 concentric is arranged. The annular space between these two tubes forms a passage 81a to Supply of heating or cooling liquid to the interior of rollers 1 and 3.

According to Pig. 14A the tubes 81 are screwed with their inner ends into central openings in the left cover, 'while their outer ends pass through waves Ib and 3b extend up to individual outer flanges 82, which the latter by means of screws with the flaps of normal rotary connections-

• -

gen 83 are connected. A twist of that splash and that Tube 81 against the rollers assigned to them is prevented by the fact that the ends of the facing screws 88 in Auxiliary flanges 89 are screwed in, which are attached to the Y / ellenstummeln Ib and 3b are firmly attached. In the same way, the bodies of the rotary joints 83 are against rotation

secured by bolts against the outer ends of stationary beams 84 which are attached to the corresponding bearing blocks 79 and are attached so that they are freely displaceable in the vertical direction.

The tubes 81 are thermally insulated from the outside by means of the sleeves Io and 3c. The tubes 85 are at their outer ends

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the fixed body of the individual slewing rings 83 connected in a manner not shown, whereby it is also with suitable condensate traps and drains in Connection. As shown in FIG. 12, this can be used to maintain a certain temperature Medium is supplied to rollers 1 and 3 through flexible inlet connections 86 and through flexible outlet connections 87 are discharged.

In Figures 13, 14A and 14-B it is shown that the upper roller 1 is covered by a channel-shaped part 91 with slightly outwardly inclined, downwardly projecting webs 91a, which the upper third of the roller in the immediate vicinity, without them However, in a touch _he outer surface physically covered. The channel 91 is welded on both sides by inclined to below

Arms 92 held, which at the outer end detachable to the Storage blocks 79 are arranged.

On the outside of the webs 91a there are joints 93 on which thin, non-ferromagnetic (for example made of stainless steel) sheet metal guides 94 are arranged, which extend along the entire roller. The first sections of the guides 94, which lie just below the ends of the webs 91a, are flat and hang on both sides of the _; *

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Roll straight down. The end sections of the guides are curved inward and taper to a point after they have partially enclosed the roller, in precise alignment with the gap formed by rollers 1 and 3. As a result, they form a perfect and precise guidance of the web 20 ', which in the device for example on the Right side runs down over guide rollers 75 and right guide 94, then through the nip runs through and via the left guide 94, the guide roller 74 to a winding device or to another location expires.

If the roller is moved by means of the hydraulic jack 71 Raised at the top to the end of the slots, the channel 91 and the guide 94 go up as a unit at the same time so that the guides 94 lie freely above the guide rollers 74 and 75 and by hand about 180 ° around their joints 93 can be folded up so that the roller can be viewed freely and, if necessary, repaired.

The two ferromagnetic (e.g. cast iron) Liagnet yokes 96 are in the shape of an open bracket or a C, with the outsides of the Cs symmetrical to the rollers and are aligned or arranged with the horizontal diameters of the rollers 1 and 3. The yokes 96 extend parallel to the 'rollers 1 and 3 over the entire length'. They are supported by ferromagnetic support plates 97 of the same length

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held screwed to the vertical plates 99 of the yokes are, which are in four substantially C-shaped fork webs welded to the horizontal channel 61 98 are made of non-ferromagnetic material. From the horizontal plate 99 are upper and lower pole pieces 100 and 101, which extend over the entire length of the rollers 1 and 3 and are aligned radially with respect to them are. The pole shoes 100 and 101 have enlarged pole shoe surfaces 95 at their free ends, which extend over the Extend the entire width of the roll and are screwed to the pole shoes by means of machine screws, not shown. The pole pieces form individual cores for the electrical coils 102, which are electrically connected to one another in such a way that that the generated magnetic attraction adds up.

109817/0333

In one embodiment, the following dimensions were provided:

Rollers 1 and 3 35 om. diameter

χ 165 cm length

Vertical plate thickness 99 63 mm Thickness of the pole pieces 100, 101 50 mm

Dimensions of the pole faces 95 31.5 mm thick

χ 112mm "wide

Distance of the pole faces 95 from the roller 1 9.5 Distance of the pole faces 95 from the roller 3 6.35 mm

The electrical coils 102 each have 105 turns of solid copper wire 9.3 mm in length and are insulated with a double layer of glass fiber insulation.

The coils 102 take 200 A direct current at 120 Y at a maximum temperature of 180 ° C.

The greater distance between the pole faces and the upper one Roller 1 in comparison to lower roller 3 was only provided to provide sufficient space for the web to pass through to have in this area.

An advantageous modification of the door direction according to Piguren 11 to 13 provides an additional power supply

109817/0333

and a current control for the coils 102 in one known to those skilled in the art Way before, for example so that, if necessary, an additional repulsive force is generated between the rollers will. Such a repulsive force is advantageous when the force exerted on the web or the fabric "Pressure should be changed or if this should even go back so far that there is no longer any pressure effect is generated by the top roller.

In another embodiment of the electrical coil, hollow or tubular copper conductors are also used an edge length of 9.1 mm (10.1 mm with insulation) and with an inner bore of 6.25 mm diameter used. Each coil 102 has 108 turns of a continuous hollow conductor, the coils however, in three sections by cutting the conductor and connecting the burning parts with two distributors are subdivided for the supply and discharge of a corresponding cooling liquid.

Since considerable thermal energy can be released in the device, air cooling is also provided for the coils 102, which is explained in connection with FIGS. 15 to 18. A ventilation housing made of non-ferromagnetic sheet metal encloses each coil and each magnet yoke on three 109817/0333

Pages, see "Figure 18, with only final Openings for the implementation of the ends of the pole pieces 100 and 101 are provided, which at these points protrude outward and thus have accessible end faces for fastening the pole faces 95, they on This way they are not "magnetically influenced" by the ventilation housing. The housing is attached to the yoke fastened by means of masonry screws. Between the two Pole pieces 100 and 101 and approximately along the entire housing 103 is in the middle of the housing 103 rectangular, closed channel 104 provided, which reduces the dead space between the yokes 96 and the flow of cooling air is distributed approximately evenly between the upper and lower coils.

The ventilation housing 103 ends on each side in main chambers which lead into an inlet line 105 and an outlet line 106. Curved guide plates 105a and 16a provided in the chamber deflect the air flow uniformly through 90 ° on the opposite sides of the housing 103. The inlet line 106 is connected via a suitable line, not shown, to a ventilator, which circulates the air at a throughput of, for example, 200 n ^J / min (7,000 scfm) through each ventilation housing 103 (400 jar / min (14,000 scfni.) in total) presses \ 7which thereby to the her .image »·

*! Π O <">'! ¹ T / Π OOO

! U b ο I // UJJJ

set surfaces of the coils 102 and the inner surface> of the yoke 96 can sweep past.

The lower periphery of the roller 3, takes v / ie to Figure 13, surrounded over the whole Iiänge with a made of magnetic material nichtferr © trough 108, which is arranged between the two vertical webs 98th The KuIde is shaped according to the roller circumference, but does not touch the roller. The "trough 108 is disposed ^ symmetrically to the vertical plane in which the axes of the rolls 1, and 3 and pivoted in said plane. The outer edges of the trough rest against the lower Eanten to the hollow space 95 of the lower pole pieces one hundred and first By suitably _s not The latch halves shown can be folded down so that the YaLs © sur inspection or cleaning can be approached at any time. The troughs 108 serve to reduce convection currents through the door direction to a minimum and at the same time prevent premd metal parts by the magnetic Pelö, zn acting there, prevent

Before the Torrichtung ZVx production geiiowiiieii in operation xvirüj warden the rollers 1 and 3 i & rotationally driven vm & Sampf mnter a Drusk of "belspielsweiss 9 ATFI ssfgegsDSIi ₃ wernig as iiäiiflg UbIIoA _3, Her = collar dip Jw-vsQZiCnng of ¥ Slee © 5 foddest? _o ITaoli ggb

1ÖS811 / Q33I

Warming up of the device v; the web-shaped material is introduced into the device by hand from a loading station such as an unwinding device, the hydraulic jacks 71 being actuated to raise the entire roller assembly including the guides 94 to the upper end of the slots 65 so that a straight line between the rollers 74 and 75 is created. If necessary, all rollers can be stopped immediately by switching off the drive, whereupon the web is drawn over the guide rollers 74 and 73. After the insertion is completed, the operator switches on the drive of rollers 1 and again. The idle time of the rollers is so short as possible, a uniform rolling temperature to maintain Any accumulation of condensate at the bottom of the roll a one% wall-free heating prevents the bottom rope of the rolls, which · unwanted Semper aturgracLienten or, in particularly start Semperaturgsfällsn, sum. by bending rollers is xiüiren Icaniu Next üureh.Betätigung an animal ^ '- iegsventils the Wlriruüg the hydraul is oh en lifter i-ffiigekdst, Woduroli ale Kol eiistar ^ ^ n 71 to go below the mia WalEeiianoranuiig 1 in the carriage 65 nacli -airdss, gsgeii push the orphan 3. They ATc »ia £ ges-5i1.vlnaf.3k5 ·!?; des ¥ a2, se wi ^ d dcircL not shown

Throttle valves regulated, which are in the drain lines of both cylinders zm storage tank for the hydraulic medium are switched on. When the roller and the guides 94 are lowered, they lie against the sheet-like structure to be treated and pull it into the device while forming a loop ^ in until the Siidabstahd between the rollers and so that the desired gap width is achieved. At this point, the path to be processed is then applied Pressure exerted. If the desired gap width of, for example, 1.5 mm has been reached, something that is not shown If limit switches are detected at the ends of both rollers, direct current is automatically applied all coils 102, but only from a few v / snlgea Amperes, for example 12 A, placed. Then wii? A the power supply by hand by the operator up to a certain value, but not higher than 200 A, 2s can of course also be an automatic Itegclüng will be introduced to the river to the desired strength with a certain " Speed increases after closing the limit switch. That is now continuously through the device running railroad material is pressed and heat-treated at the same time.

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the machine then ran with the coils energized while the upper roller 1 and its accessories were raised switch when opening the above mentioned limit switches as a result of the lifting of the rollers these.die coils gradually by reducing the coil current with regulated Speed by means of a circuit not shown, for example at a speed from 100 A / min to the value Full. A proper decay of the magnetic is thereby achieved Field.

Should maintenance work or a replacement the rollers 1 or 3 take place, this is done by locking the drive couplings, removing the plague holder of the brackets 72 and pulling the pins 73 out of the ends of the piston rods 70, temporary Folding the cylinder 71 sideways out of the slots 65 and finally lifting the whole Rolling device including bearings, bearing blocks, Coupling halves and rotary connections from the device by means of a suitable elevator, not shown possible. If you have already provided a fully equipped replacement roller for the device beforehand, you can the device can be reassembled in a very short time, so that only a correspondingly low production loss occurs.

1038 17/0333

The roller surfaces can be embossed or with patterns, just like the embossing and printing process require, be provided. The surfaces can also be provided with a wear protection layer, for example by nitriding, such processes, which increase the magnetic resistance can of course only be used with dimensions.

Magnetic pre-tensioning according to the invention can also be achieved through the use of permanent magnets, as shown in Figures 19A and 19B will. In these figures, however, the stands are omitted to simplify the illustration.

The ferromagnetic rollers 1 and 3 shown in FIGS. 19A and 19B are hollow and arranged so that that they touch each other tangentially, their axes lying in a common vertical plane. For this purpose, their ends are in non-ferromagnetic ball bearings 46 mounted, the inner surfaces of which on stationary U-shaped, ferromagnetic yokes 50 and 51 circular Arranged in cross-section, the ends of which crossbars line arms 47 and 53 beyond the roller ends the joohe reach from the reels naoli behind and are at their ends by means of two axially aligned rotating

/are

donate 48, which "if required in 'bearings ^ that can accommodate both radial and internal forces., guided so

1098 17/0333

any unwanted friction at these points is eliminated. As can be seen from Pigur 19A, lie the arms of the yokes near the pivot pins 48 .-

Inside the rollers, permanent magnets 49 and 50 are firmly attached to the inside arranged, the inner surfaces of which have a small distance from the yokes of 0.125 mm, for example, while the side or end faces of the magnets each other touch. Each permanent magnet is manufactured in such a way that its outer cylindrical surface has a given polarity has, here hordes with the magnets 49 and south with the magnets 50, while the whole cylindrical Inner surface of course has the opposite polarity.

Under these conditions, the rollers 1 and 4 are magnetically drawn towards one another, the transverse joints of the yokes 50 and 51 », which are polarized as shown, close the magnetic circuit of the door direction through the arms 47 and 53 . It is important that the yokes are large enough to allow magnetic saturation to occur. The bearings 46 are also made of non-ferromagnetic material so that any magnetic shielding is switched off by this part.

109 * 17/0333

In the "device with the rollers 1 and 2 shown in Figure 20, the associated yokes are practical, like that of the alignment according to Figures 19A and 193. executed. The crossheads of the yokes, however, are something longer than in Figures 19A and 19B to still be electrical Coils 55 and 56 wound around the yokes using them as a core. These coils 55 and 56 are so with connected to a DC voltage source that they are not in V / eise shown are magnetically opposite to one another, so that the crossheads within the rollers are the same Have polarity over their entire length. The two coils on each yoke are of course connected so that in the two crossheads opposite polarities, on which the rollers 1 and 3 by means of non-ferro-magnetic bearing 46 * are carried out.

The rollers 1 and 3 are very thick-walled hollow cylinders shown, the insides of which come very close, for example 0.125 mm, to the crossheads, polygamy of course "are the rope of the yokes. For example, the roller sections located near and at the roller gap take the" inner " and external polarities, as shown in the figures when magnetized by the coils 55 and 56.

In a modification of the construction according to FIG

109817/0333

52 ^! are used, provided that the junction is left completely omitted to the left of the dashed line 57 and leaves a ferromagnetic path that conducts magnetic fields to the left of these lines. If constructive support is required on the left-hand side, non-ferromagnetic supports can be provided at the point.

The embodiment of the invention according to Figure 25A, in which the stands and auxiliary equipment for simplification are omitted from the illustration is somewhat similar to that of FIGS. 7 Ms 10 if one considers them disregards that the electromagnet is in shape over the whole Length of the coils 116 and 117 wound on the yokes 188 and 119 and to the rope within the gap between the ".falzen 1 and 3 are arranged. The yoke ends are arched to match the curvature of the rollers and extend up to close to the courtship, but without touching them. The corresponding Pole ends of the yokes can have different distances from the rollers to accommodate the thickness of the machined To be able to adjust the web. The coils of the yokes are connected to a direct current source, which is the specified Magnetization causes.

The advantage of this construction is that the rollers 1 and 3 not only due to the magnetic flux through the nip are attracted, but also via the yokes, which the forces identified with the vector F.

109817/0333

generate whose vertical components additively increase the attraction in the gap. Is it supposed that, the vector]? is at 45 ° to the plane through the roller axes, then the total force between the rollers is about 40 fi greater than "in the embodiment according to Pigur 8 with the same main dimensions of the components and coils with the same number of ampere turns.

In FIGS. 25B and 26, a modification of the construction according to J? Igur 25A is shown, which is modified accordingly is that a straight passage of the web through the device is made possible. Here are the yokes 123 and 124 in the longitudinal direction longitudinally through the short crossheads, the U-shaped yokes split, creating horizontally arranged pole pairs 123a and 123b as well as 124a and 124 "b on opposite sides of the pair of rollers within the gap. Even . 'Here the pole ends are arched to the Adjust the outer surface of the rollers. The four coils are connected to a direct current source that the illustrated magnetic field orientation results.

In all the embodiments of Figures 25A and 25B as 26, the permanent magnets can if necessary. IDlectromagnets are exchanged.

109817/0333

If permanent magnets are used, so can

Means to regulate the attraction between

/ se

the rollers 1 and 3 are provided. They can be designed, for example, as mechanical devices for adjusting the position of the permanent magnets towards or away from the roller gap. For example, suitable synchronizing means can be provided which is responsive to a web thickness measuring device or other measuring device which automatically makes this puncture. Similar devices can natuer - also lent the coil current in the Ausführungsforir: s of the invention with coils regulate.

While the four described embodiments of the invention relate solely to printing devices related to rollers, the invention is in no way intended to be limited to such devices. In the Figures 27A and 27B are schematically such constructions

Functions shown in which a flat printing device works together with a single roller. Such devices are particularly advantageous when Sheets or the like of sheet-like materials are intended to be embossed, printed or pressed. The leaves can be drawn in during each work cycle and during retrieval be ejected.

109817/0333

The printing device 1 is a ferromagnetic one cjründrische roller on which at their ends in after downward guide slots 126 attached to a horseshoe-shaped ferromagnetic yoke 127 Web is mounted, on .which an electrical coil 128 rait au a direct current source leading lead si tuiigen is wound up. Gate of the lower Inner surface 127a of the yoke are two running rails

/in
arranged, the running surfaces of which pass over the surface 127a steplessly. Over these guides is the plate 131 »which is the wider printing device of the printing device pair. forms, can be moved back and forth. The plate 131 can be driven in a known manner, for example by a crank drive or the like »

In some balls, a prolonged application of pressure on the continuous web is desirable. This can be achieved with the embodiment according to FIGS. 28A and 28B.

Here a three-roll set of spaced-apart printing device pairs is used in which an endless belt 133 through the two consecutive ones Column is guided / The roller 1 presses against the roller 3 * and 3 "» which approximately at an angle of 90 ° around the axis of the roller 1 as a reference point

109817/0 3 33

is rotated. The web 20 'can, for example, come in from the right and exit on the left, as in FIG. 28A. On the way along the perimeter of the fold i is the path exposed to pressure over the entire 90 °.

Either only a single yoke arranged on the inside, as shown in FIG. 28A, or paired yokes on the outside, as indicated in FIG. 28B, can be used. The embodiment according to FIG. 28A has a straight ferromagnetic core 124 with the electrical coil 135. The IPoIflachen of the yoke are shaped to correspond to ^{the circumference of the rollers 3 1 and 3 ″.}

The yokes 137 according to FIG. 28B have ferromagnetic channel-shaped cables on which the electrical coils 138 are wound as a core. They are connected to a DC voltage source in such a way that the magnetic attraction over the two pairs of salts is added. Polarities resulting, for example, are entered in FIGS. 28A and 28'B using the known ITord and South designations. In the embodiment according to FIG. 28, the inflow and outflow of the web 20 ^{l is} also restricted from above.

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The exertion of pressure over an angle of 90 ° on the However, continuous cream has been preserved.

A preferred embodiment of an apparatus with a reciprocating plate is shown in Figures 29A and 29B, in which the roller 1 in slots 126 »in vertical beams 141 of the stationary machine frame 142 is performed. The curved ferromagnetic yokes 143 are also attached to these, which act as the core the coils 144 are wound. On the underside of the yokes 143 there is a small gap to the reciprocating Plate 115 left. The plate is on rails 146 for example with the help of a crank drive or rack and pinion drive shifted in a known manner. Polarities which are established, for example, are shown in FIG

/ ge 29B indicated. The yoke is built up symmetrically, which means transverse magnetic forces are effectively switched off.

Depending on the particular application, a number of modifications of the embodiments described can be made make. One or each of the two printing devices be provided with blastomeres or other non-ferromagnetic coatings on the circumference, although thus an appointment & eration of the forces of attraction between

100817/0333

the rollers due to the larger gap in the magnetic circuit connected is.

The surfaces that come into contact with the web the rollers 1 and 3 can have a wide variety of surface patterns have, for example they can be corrugated, toothed or notched or a Waffle pattern, the pattern of an orange peel or have different patterns.

Finally, pressure control using suitable measuring devices or converters can be used Determination of the roller spacing, the thickness of the outgoing web, the web density, the web surface properties and quality or other more significant Parameters, may be provided, the measured variable then being used for automatic control of the Current for the Yorspannspulen is used, so that the pressure between the rollers brenzen in certain can be held.

Depending on requirements, non-ferromagnetic plates, slideways or rollers can be used as path guides additionally be provided.

<4 ⁵ StJS - ».. J ₁ Jf S- g f - ^ ₅ Jt ^ J, ^; ^ E

■ _47-

When designing the "besclir! Plane devices The following general considerations apply:

1. The practically achievable upper limit of the Attractive force between the pressure devices is achieved when magnetic in the magnetic flux path Saturation occurs. Higher values can be achieved if "materials with higher magnetic saturation are used or if the cross-section of the magnetic flux path at the narrow points, if possible, enlarged will.

2. Line prints can be made between the folds in the order of magnitude of 90-110 kp / cm gap width with gap widths of 0.25 mm and less. Larger gap widths can be accepted if lower magnetic loads are applicable, however, the gap width should, if possible, be a maximum of 7.5 mm.

3. Any displacement of the roller axes should be avoided so that there are no periodically recurring ones Fluctuations in the forces of attraction between the rollers occur. The highest permissible dislocations

10 98 17/0333

are a function of the sum of all air gaps in the magnetic circuit including, the gap between the reels. The greater the sum of the column, the more The permissible substitution is also greater. If possible, the gap width fluctuation should be smaller than 0.75 now, which corresponds to an eccentricity of 0.58 mm, being held.

4. In all devices with magnetic flux conductors (magnetic yokes), the rollers should be symmetrical between the facing poles "or areas of the Jiagnet river ladder or yokes are arranged, that is, the gap width on one side of the roller should not be significant must be larger than the one on the other side, otherwise larger lateral forces on the rollers due to the unbalanced magnetic forces of attraction exerted.

5. When using 1-magnetic flux conductors and / or Magnetic yokes should be the number and size of the gaps in the magnetic flux path or in the magnetic flux circle must be kept as small as possible so that for a given number of ampere-turns of the coils the highest possible There is attraction between the rollers. The gap between the orphans and the magnetic flux conductors or I-IagnetJochen should be in the order of magnitude

10 9 8 17/0333

from 0.75 "to δ.5 now, only when" is used relatively long, soft, easily deflectable rollers should be the gap between the rollers and the magnetic flux conductors "or Kagnet jociien be so large that with -mittlerer mechanical transverse deflection of the orphan no imbalances grant 'magnet is clien forces of attraction occur, the roller against the magnetic flux guide or the magnetic yoke bend where it remains until the coil is de-energized.

6. In the embodiments in which the coils do not enclose the oruok facilities but only l'eile the magnetic flux conductor or magnet 3 ο before as cores, the coils arranged on opposite sides of the device should be about the same Arrrperewindungszelil with an accuracy of + 1? I.

7. In general, the rollers of the devices should not rotate at such a high speed that that more heat is generated due to the eddy current losses than can be dissipated without an excessive increase in temperature is. This limits the speed that can be used, ■ as long as no particularly intensive cooling measures are provided will.

Claims TDXV 109817/0333

Claims (1)

1A-31,792 claims 1. Device for equal loading of elongated iliiter gels passing through a gap, calculated by a pair of forroaagnetic loading tsw. Druckoinricht ^ nson (1, 3, 131 "145)" of which at least one of a do IHRD horisontale Achee rotatably © Valse (1) »comprising a sur eioh parallel to the longitudinal axis of the or each W & lae erstrecken- 'the gap AUTN ¹ IiTBe of the gate and are so arranged »4a & ei © eich freely gonetnand & äc move ^ on in such a direction» in which the gap width is variable »and by at least one device (6, 16, 21 _f 23, 24» 26, 27 » 28 _f 29, 31, 32, 33, 34, 35, 36, 49, 50, 55, 56, 127, 128, 134, 137 »133, U3, 144) stubbornly generation of a through the printing devices in the through the roller lenght3achce and Törlauienden I4agnut £ Luaees (Kagaetfeldos) xait # 1 a view through which the Uruckeinrichtunscn can be tested against each other » 2 '' Torrichtung nacli responded 1 »g characterized 9 * kennseichnet that the Binrlohtunnen aur 109817/0333 Immediate generation of a flow by the printing devices (1, 3 >> 1 $ 1 ₉ 145) has an essentially uniform magnetic flow at least one electrically insulated coil (6, 16, 29, 33, 34, 35, 36, 123, 138, 144) on white op. The axes of which lie essentially with the plane through the longitudinal axis of the rotating devices and the gap. Gate direction according to claim 2, characterized in that the device x for generating a magnetic flux through the bridge device (1, 3 »131» 145) with ira essentially equal Hagnetflussdlchte ferr & magnetisehs Magnetilußlelfcar (21, 22, 23, 24, 26, 27 · 28, 31. 32, 12 ?, 134, 137, 143), which has the 24magnetfludkreis between the Close pressure devices and the bobbin 4 · Device according to one of claims 1 to 3 »characterized in that the pressure devices consist of a pair of cylinder vals (1, 3) exist· 5 «Device according to claim 4, characterized in that the Slnriohtung for Xraeugung an a nagnetfluaseadureh dl «rollers (1,3) with an essentially equal magnetic flux roof 109817/0333 ^: η β In «one switches in series with a direct current source * bare electrically insulated coils (6, 16 »29, 33» 34 » 35 · 36) »which is symmetrical to the two rollers of the Cylinder whale pairs are arranged «have. 6 · Device according to one of claims 3 I) Ie 5 »characterized in that the pole surfaces of the magnetic flux conductors (21, 22» 23 »24» 26 »27» 28, 31 »32, 127» 134, 137, 143) ^{X of} the magnetic field lines are in the immediate vicinity of the circumference of the rollers (1, 3) and about as long as the Valsen and that the individual * electrically isolated coils (16 »29» 33 »34» 33 »36» 128, 138 »144 ) to the magnetic flux this eind wound using as cores and DAB poled to the coils a to-Glelchspannungequelle so Gchließbar _r Aware that the Valsen at eIngesehalt · tarn current are drawn against each · Device according to claim 6, characterized in that the pole faces of the magnetic flux filters essentially wipe close to the gap the Bjlindrlschen Vslsen (1, 3) arranged oind. 8 · Door direction according to claims t to 7 »characterized in that the devices sur Ereeung a magnetic flux with an im Bundling 109817/0333 permanent magnets (49 »50) have substantially uniform magnetic flux density« 9 · Device according to claim C _9, characterized in that the permanent magnets are arranged bo sum bridge device pairs] that they have opposite polarity transversely to these. 10 · Device according to claims 1 to 9? characterized in that the prints inriclatungen a middle ia her · horizontal Achaa rotatable · Value (1) and several second whales (3 ¹ , 35 ") 'have, the approx. circumference of the middle roller and with angular distance with respect to the longitudinal axis of the middle V 'Alze from each other and par all oil to it and in each case among other things their axis rotatable and freely versohlebllch in relation to the middle roller, nowie with the middle roller each form a the material aulnoliaondon gap and d: ^ a through the gap guf LCirtor gills (133 ) to support olnc3 elongated materials guided through the device (2O0 gate is seen 11 · Gate direction according to claim 1, characterized in that one of the pressure devices (1) and 109817/0333 the other is designed as a flat plate (131, 145) is what nit dor tlalzo iron su their Länsiaanae forms a gap lying in one plane 109817/0333